Discussions are being held to decide whether King Tuheitia's commitments at the end of the year will be passed onto someone else.
The Maori King has been in hospital since Sunday night due to "diabetes-related ailments", King spokesman Tukoroirangi Morgan said.
Initial reports suggested he had suffered a heart attack, however Mr Morgan told reporters gathered at Te Manukanuka o Hoturua Marae in Auckland that this was not the case.
"It can be confirmed that he did not suffer a heart attack," he said.
Mr Morgan said discussions were being held as to who would represent the King in his official duties if he was too unwell.